142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
#include "HL_NetworkFrame.h"
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#include "HL_InternetAddress.h"
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#define ETHERTYPE_MPLS_UC (0x8847)
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#define ETHERTYPE_MPLS_MC (0x8848)
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#define MPLS_STACK_MASK (0x00000100)
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#define MPLS_STACK_SHIFT (8)
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NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForEthernet(NetworkFrame::PacketData& packet, InternetAddress& source, InternetAddress& destination)
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{
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PacketData result(packet);
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const EthernetHeader* ethernet = reinterpret_cast<const EthernetHeader*>(packet.mData);
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// Skip ethernet header
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packet.mData += sizeof(EthernetHeader);
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packet.mLength -= sizeof(EthernetHeader);
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// See if there is Vlan header
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uint16_t proto = 0;
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if (ethernet->mEtherType == 129)
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{
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const VlanHeader* vlan = reinterpret_cast<const VlanHeader*>(packet.mData);
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packet.mData += sizeof(VlanHeader);
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packet.mLength -= sizeof(VlanHeader);
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proto = ntohs(vlan->mData);
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}
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// Skip MPLS headers
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if (proto == ETHERTYPE_MPLS_UC || proto == ETHERTYPE_MPLS_MC)
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{
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// Parse MPLS here until marker "bottom of mpls stack"
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for(bool bottomOfStack = false; !bottomOfStack;
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bottomOfStack = ((ntohl(*(uint32_t*)(packet.mData - 4)) & MPLS_STACK_MASK) >> MPLS_STACK_SHIFT) != 0)
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{
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packet.mData += 4;
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packet.mLength -=4;
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}
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}
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const Ip4Header* ip4 = reinterpret_cast<const Ip4Header*>(packet.mData);
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if (ip4->mProtocol != IPPROTO_UDP)
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return PacketData();
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switch (ip4->version())
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{
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case 4:
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return GetUdpPayloadForIp4(packet, source, destination);
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case 6:
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return GetUdpPayloadForIp6(packet, source, destination);
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default:
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return PacketData();
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}
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}
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NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForSLL(NetworkFrame::PacketData& packet, InternetAddress& source, InternetAddress& destination)
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{
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PacketData result(packet);
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if (packet.mLength < 16)
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return PacketData();
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const LinuxSllHeader* sll = reinterpret_cast<const LinuxSllHeader*>(packet.mData);
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packet.mData += sizeof(LinuxSllHeader);
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packet.mLength -= sizeof(LinuxSllHeader);
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switch (ntohs(sll->mProtocolType))
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{
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case 0x0800:
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return GetUdpPayloadForIp4(packet, source, destination);
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case 0x86DD:
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return GetUdpPayloadForIp6(packet, source, destination);
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default:
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return PacketData();
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}
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}
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NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForIp4(NetworkFrame::PacketData& packet, InternetAddress& source, InternetAddress& destination)
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{
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PacketData result(packet);
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const Ip4Header* ip4 = reinterpret_cast<const Ip4Header*>(packet.mData);
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if (ip4->mProtocol != IPPROTO_UDP)
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return PacketData(nullptr, 0);
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result.mData += ip4->headerLength();
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result.mLength -= ip4->headerLength();
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const UdpHeader* udp = reinterpret_cast<const UdpHeader*>(result.mData);
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result.mData += sizeof(UdpHeader);
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result.mLength -= sizeof(UdpHeader);
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// Check if UDP payload length is smaller than full packet length. It can be VLAN trailer data - we need to skip it
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size_t length = ntohs(udp->mDatagramLength);
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if (length - sizeof(UdpHeader) < (size_t)result.mLength)
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result.mLength = length - sizeof(UdpHeader);
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source.setIp(ip4->mSource);
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source.setPort(ntohs(udp->mSourcePort));
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destination.setIp(ip4->mDestination);
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destination.setPort(ntohs(udp->mDestinationPort));
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return result;
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}
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NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForIp6(NetworkFrame::PacketData& packet, InternetAddress& source, InternetAddress& destination)
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{
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PacketData result(packet);
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const Ip4Header* ip4 = reinterpret_cast<const Ip4Header*>(packet.mData);
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if (ip4->mProtocol != IPPROTO_UDP)
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return PacketData(nullptr, 0);
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result.mData += ip4->headerLength();
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result.mLength -= ip4->headerLength();
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const UdpHeader* udp = reinterpret_cast<const UdpHeader*>(packet.mData);
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result.mData += sizeof(UdpHeader);
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result.mLength -= sizeof(UdpHeader);
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/*
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if (result.mLength != ntohs(udp->mDatagramLength))
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return PacketData(nullptr, 0);
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*/
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source.setIp(ip4->mSource);
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source.setPort(ntohs(udp->mSourcePort));
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destination.setIp(ip4->mDestination);
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destination.setPort(ntohs(udp->mDestinationPort));
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return result;
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}
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